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Originally Posted by PrimeBMW
I guess I don't follow your question. Explain when and where you have an issue with the stock diff.
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The OE m variable diff seems to be a step behind especially when you start to get into a tank slapper. I would guess that the clutch diff would be better since it has faster engagement.
The problem I had with my metric mechanic 3 clutch LSD on my 330 was the clutch packs would groan when it got hot. I added FM to 75w-140...still would groan.
I think I'd take the groan at this point.